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Herein, pH-responsive poly 4-hydroxyphenyl methacrylate single-walled carbon nanotube (PHPMA-SWCNT = f-CNT)/PE nanocomposite (NCST) fiber membranes were developed for stimuli-responsive drug delivery and the selective removal of Pb2+ and Cd2+ from wastewater. The NCST fiber membranes were primed using Forcespinning®, followed by a heat pressure method. The obtained NCST membranes exhibited several favorable properties of nanocarriers and nanoadsorbents. The composite membrane displayed record-high tensile strength (13.7 ± 3.2 GPa), Young's modulus (243.3 ± 5.2 GPa), and toughness (1421 J g−1). This represents the strongest and stiffest composite material among all the reported nanocomposites to date. A hydrophobic drug molecule (curcumin (Cur))-encapsulated NCST membrane displayed a pH-mediated Cur release in a controlled manner. The NCST membrane displayed …